I first quit a substance at the tender age of nineteen, when heroin addiction brought me to my knees within a year. It was my freshman year of college and I’d started using it with my boyfriend. Our primary method of using was “chasing the dragon”: a process that involved putting some black tar on a piece of tinfoil and “chasing” the vapors from the heated tar using a tube — usually just a plastic Bic pen with the ink tube removed.